diff --git a/gnu/packages/c.scm b/gnu/packages/c.scm
index 8e51af0346..e2e445d3f4 100644
--- a/gnu/packages/c.scm
+++ b/gnu/packages/c.scm
@@ -700,7 +700,7 @@ (define-public aws-c-io
 (define-public aws-c-cal
   (package
     (name "aws-c-cal")
-    ; Update only when updating aws-crt-cpp.
+    ;; Update only when updating aws-crt-cpp.
     (version "0.5.17")
     (source (origin
               (method git-fetch)